99 Most useful Social Media and PR Blog posts of 2009

Adam Vincenzini from The Comms Corner Blog, picked the 99 most useful social media (and PR) posts of 2009. He divides all the links into these categories: general social media, Twitter, PR, Facebook/LinkedIn, case studies, mobile/content/SEO/other, and his own posts. I hope, bellow his list of post would be very useful to all those who are very intrested on Social Media.